private void PlayField_LevelChanged(object sender, TetrisField.LevelChangeEventArgs e)
        {
            lock (LockTetImageRedraw)
            {
                NominoImages    = null;
                NominoSKBitmaps = null;
            }

            //throw new NotImplementedException();
        }
 public void InvokePlayFieldLevelChanged(object sender, TetrisField.LevelChangeEventArgs e)
 {
     PlayField_LevelChanged(sender, e);
 }